Reciprocating-shuttle sewing-machine.



J. 0. HUPFMAN & B. JV. LAUPFBR. REOIPROGATING SHUTTLE SEWING MACHINE.

APPLICATION FILED APB..25, 1910.

Patented June 20, 1911.

l. 0. HUFPMAN & E. J. LIAUFFER.

RBGIPBOGATING SHUTTLE SEWING MACHINE.

APPLI'OATION FILED PB z, 1910.

99519539e A Y Patented June 2o, 1911.

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JOHN 0. I-IUFFMAN ANI) EMIL J. LAUFFER, 0F CLEVELAND, OHIO, ASSIGNORS T0 THE WHITE SEWING MACHINE COMPANY, OHIO.

OF CLEVELAND, OHIO, A CORPORATION OF RECIPR-OCATING-SHUTTLE SEWING-MACHINE.

To all whom 'it 'may concern:

Be it known that we, JOHN O. I-IUrrMAN and EMIL` J. LAUFFER, citizens of the United States, and residents of Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Reciprocating-Slnittle Sewing-Machines, of which the following is a full, clear, and exact description.

This invention relates to the reciprocating shuttle carrier of a sewing machine, the mounting thereof and the mechanism for imparting to it a smooth reciprocatory n1ovement,-the object of the invention bcing to construct and combine said parts in such manner that they shall be efficient and durable and relatively of low cost.

The invention is shown in the accompanying drawings, and is hereinafter described and definitely pointed out in the claims.

In the drawing, Figure l is a bottom plan View of a sewing machine head, and so much of the mechanism, carried thereby, as has to do with the present invention. Fig. 2 is a front view of the parts constituting the present invention, some of said parts being sectioned. Fig. 3 is a vert-ical sectional view in the plane of line 3 3 on Fig. 2; and Fig. 4 is a vertical sectional view on line L-d of Fig. 2.

Referring to the parts by letters, A represents the bed plate of a sewing machine head; and D represents a driven shaft mounted in suitable bearings on the under side of said bed plate, and extending length- .wise of the head-that is to say from left to right. Those familiar with this art will understand thata shaft located in the position stated is generally found in reciprocating shuttle sewing machines. It is driven by various kinds of mechanism, well known, and therefore it has not been thought necessary to show the driving mechanism. It will be understood also that this shaft has certain other functions to perform besides merely driving the shuttle carrier, as, for example, the operation of the feed bar,-- which parts, however, not being concerned in the present invention, are not shown.

B represents the shuttle carrier which lies between the shaft D and the bed plate A and is pivoted to the latter on a vertical axis which intersects t-he horizontal axis of the shaft D. The left end of the shuttle can Specification ofletters Patent.

Application filed April 25, 1910.

Serial No. 557,355.

rier is fashioned to form a support or seat for the shuttle, and this may be an independent piece as B fixed to the arm B. At the right side of t-he pivot of the shutt-le carrier, the latter is provided with two de-` pending rigid fingers; and these embrace the peculiar inclined or elbow crank pin (Z of the shaft D. The use of the elbow crank has several advantages over the ordinary crank whose pin is parallel with the axis of the shaft,-and among those advantages the following may be mentioned, viz. The iingers may be rigidly fixed to the shuttle carrier, which would not be possible if the crank 'were of the ordinary sort; the shaft may be placed nearer the bed plate than it could if the crank were of the ordinary sort; and finally the frictional wear of the fingers on the crank is distributed lengthwise of t-he crank for a distance greater than the mere width of the fingers.

The pivotal connection between the shuttle carrier and the bed plate of the machine consists of an annular cup b formed on the shuttle carrier, said cup forming one part of a ball raceway. The cone E, which forms the other part of said raceway, has a threaded shank e which passes through a hole in the cup o and screws into the bed plate A. The upper part of this threaded stem is longitudinally slitted. There is also a hole extending from the lower end of this cone piece upward to the slitted part thereof and the inner end of this hole is conical, as shown in Fig, 3. A screw F is screwed into this hole; and, after the cone E has been set to the proper position to form a suitable raceway for the balls G, this screw F is screwed in and the upper split stem c is spread so as to lock it against rotation in the bed plate. This cone is, therefore, the piece upon which the shuttle carrier is supported through the medium of the anti-friction balls G. As these or the raceway surfaces wear the screw F may be unscrewed a little and the cone E adjusted, and then locked again by screwing in screw F.

Having described our invention, claim:

1. In a sewing machine, the combination of a bed plate, and a shuttle carrier having an integral ball raceway cup, a cone having a threaded stem which is screwed into the bed plate and forms with said cup a ball race, and balls mounted in said race, said Patented J une 20, IQIL carrier having at one end a seat for the shuttle, and atits other end two rigidly attached and downwardly extended fingers, wit-h a rotatable shaft having an elbow crank which lies between and in contact with said two fingers,-said shaft being arranged below the shuttle carrier with its Yaxis intersecting a prolongation of the aXis of said shuttle carrier.

2. In a sewing machine, the combination of a bed plate, and a shuttle carrier having` an integral ball raceway cup, a cone having a threaded stern which is screwed into the bed plate and forms with said cup a ball race, and balls mounted in said race, said cone member having a hole extending from its lower end upward into the threaded stem,

Ysaid threaded stem being slitted from its upour signatures in the presence of two witnesses.

JOI-IN O. HUFFMAN. EMIL J. LAUFFER. Witnesses:

H. R. SULLIVAN, E. L. THURsToN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

